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for each analyte. Sample containers will be chemically preserved by the laboratory prior to going into the field. Care will be taken when transferring the water from the bailer to the sample containers to avoid turbulence and all VOA vials will be filled above the top of the opening to form a positive meniscus so that no headspace will be present. 5.0 SOIL AND GROUNDWATER SAMPLE HANDLING PROCEDURES The following procedures will be used for soil and groundwater sample handling: 1. Each retained sample will be labeled using waterproof ink with the project name, borehole I.D. number, sample depth (for soil samples), time and date collected, and the initials of the sampler. 2. Immediately after sample collection and labeling, the samples will be sealed in a plastic bag and placed in a sturdy ice chest. The temperature in the ice chest will be maintained at or below 4 °C. 3. Soil samples and groundwater samples will be delivered to a State of California -certified chemical analytical laboratory within 48 hours of sampling along with a completed chain -of -custody record. 4. Soil samples not selected for laboratory analyses will be placed in iced storage for no fewer than 14 days. 6.0 QUALITY ASSURANCE/QUALITY CONTROL In order to ensure a successful sampling program, Quality Assurance and Quality Control procedures will be carefully followed. The key points of the Quality Assurance procedures pertain to the submittal of quality assurance samples and document control (decontamination procedures have been previously discussed). 6.1 Quality Assurance Samples Quality assurance samples will be used to evaluate the quality of the data obtained from the field program. Two distinct types of quality assurance samples will be used for this purpose. 1. Blind duplicates of water samples will be submitted to the testing laboratory at a minimum rate of 1 per 10 regular samples obtained, but no less than one per ice chest, to determine the precision of the laboratory analyses. 2. Field travel blanks will be submitted at a rate of 1 per 10 water samples collected, but no less than one per ice chest, in order to determine if cross contamination occurred in transit. All field travel blanks will be supplied by the testing laboratory. 3. Soil and groundwater samples will be submitted to a State of California -certified analytical laboratory for chemical analyses. Established QA/QC procedures for analytical operations will include sample custody procedures, standards of analytical accuracy, analyses of matrix spikes and method blanks, data reduction, verification of raw analytical data, and maintenance of control charts to monitor analytical